08577: gx4000,cpc6128p,cpc464p: Green monitor selection only changes background color

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08577	Color/Palette	Minor	Always	Mar 3, 2023, 21:21	Mar 8, 2023, 02:25

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Confirmed			Driver	amstrad/amstrad.cpp
Version	0.252	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08577: gx4000, cpc6128p, cpc464p: Green monitor selection only changes background color
Description	Emulation of the "Plus" series of Amstrad CPC machines has a bug under "Machine Configuration", where selecting the "GT64 Green Monitor" only changes the background color to green.
Steps To Reproduce	-Load the gx4000 driver with any game -Menu, Machine Configuration, Monitor -> GT64 Green Monitor -If you go back to selecting the other monitor, the background color will change to an also incorrect grey shade.
Additional Information	The cpc464 driver behaves correctly.
Github Commit

Flags
Regression Version
Affected Sets / Systems	gx4000,cpc6128p,cpc464p

Attached Files	pang.png (11,676 bytes) Mar 3, 2023, 21:21 Uploaded by ICEknight gx4000 pang

No.21137 Robbbert Senior Tester Mar 3, 2023, 23:32	Confirmed. Selecting the GT64 monitor makes the background green instead of the foreground. Changing it back to CTM640 makes the background grey.
No.21146 Haze Senior Tester Mar 5, 2023, 09:50	the plus machines have their own dynamic palette, so it's easy to see why this happens.
No.21147 mahlemiut Developer Mar 5, 2023, 20:42	I wonder what a CPC Plus would actually display on a GT64, the Plus range had their own monochrome and colour monitor. While you could connect a GT64 or CTM640 to a Plus, you'd also get no sound, as the speaker was moved from the base unit, to the monitor. The Pluses should really have their own, separate monitor options.
No.21152 ICEknight Tester Mar 8, 2023, 02:25	You can still connect some amplifiers to the Plus' headphone jack, same as you can do when connecting other systems like the Spectrum +2A and a +3 (which, by the way, look amazing on a CTM644). I guess that the ideal scenario would be to give all systems access to any device with compatible connectors (Vas is doing a great job with the controllers in this regard), and assign to each monitor device their respective features, such as the green/amber tint, adjustment knobs, additional displays, etc, instead of having them depend on the system's driver.